Book recommendations We asked our contributors about their favorite sales books – here are the results: The Challenger Sale by Matthew Dixon and Brent Adamson Recommended by: Jakob Gillmann, Adjust; Edward White, Interana; Stefan Groschupf, Automation Hero; Jens Hutzschenreuter, Digital Business Group; Peter Krauss, CoSelling Crossing the Chasm by Geoffrey A. Moore Recommended by: Ian Collins, Wysdom; Amnon Drori, Octopai; Jakob Gillmann, Adjust; Clare Jones, what3words The Challenger Customer: Selling to the Hidden Influencer Who Can Multiply Your Results by Matthew Dixon, Brent Adamson, Pat Spenner, and Nick Toman Recommended by: Jakob Gillmann, Adjust; Peter Krauss, CoSelling The Hard Thing About Hard Things: Building a Business When There Are No Easy Answers by Ben Horowitz and Kevin Kenerly Recommended by: Jakob Gillmann, Adjust; Clare Jones, what3words 76